Yeah, if you copy Twitter’s UI users will expect it to behave like twitter.
Again, breaking from that expectation is not an inherently bad thing. Fediverse projects are not looking for some stupid IPO pump and dump exit strategy.
Decentralization is not a feature, it’s an implementation detail.
Decentralization is an implementation detail to achieve the feature that is “an online service that doesn’t treat you like cattle and owns all of your fucking data”. Clear?